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Electron stimulated desorption of O– and O2– from condensed ozone: possible implications for the heterogeneous photochemistry of stratospheric O3

Tegeder, Petra; Kendall, Paul A.; Penno, Martin; Mason, Nigel J. and Illenberger, Eugen (2001). Electron stimulated desorption of O– and O2– from condensed ozone: possible implications for the heterogeneous photochemistry of stratospheric O3. Physical Chemistry Chemical Physics, 3 pp. 2625–2629.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1039/b101137p
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Abstract

We have studied the desorption of negative ions following low energy electron impact (0–15 eV) to ozone condensed in multilayer amounts on a cryogenically cooled gold surface. Intense desorption of O– is observed at low electron energies (below 4 eV) ia pronounced resonances with an estimated desorption cross section of the order of 10–18 cm2 (peak value). The resonant features in the ion yield indicate that O– desorption is driven by dissociative electron attachment to O3 molecules at or near the surface. While dissociative electron attachment (DA) from gas phase ozone generates the fragment ions O– and O2– at comparable intensities, desorption of O2– from condensed ozone is strongly suppressed, being only weakly observed within a resonance located at 7 eV. Possible implications for the heterogeneous chemistry of ozone on polar stratospheric cloud (PSC) particles, namely photo-induced dissociative electron transfer from the substrate, are discussed in the light of the effective O– desorption observed at low electron energies.

Item Type: Journal Article
ISSN: 1463-9076
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4339
Depositing User: Users 6827 not found.
Date Deposited: 05 Jul 2006
Last Modified: 24 Nov 2014 12:02
URI: http://oro.open.ac.uk/id/eprint/4339
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